Missing authentication in SINAMICS Medium Voltage Products
Priority MEDIUM 45CWE-306Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-306.
Summary
The Telnet service of the SIMATIC HMI Comfort Panels system component in affected products does not require authentication, which may allow a remote attacker to gain access to the device if the service is enabled. Telnet is disabled by default on the SINAMICS Medium Voltage Products (SINAMICS SL150: All versions, SINAMICS SM150: All versions, SINAMICS SM150i: All versions).
Why it matters now
EPSS 0.01678 77th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | SINAMICS Medium Voltage Products | SINAMICS SL150: All versions, SINAMICS SM150: All versions, SINAMICS SM150i: All versions | — | No fix listed | CNA |
- SINAMICS Medium Voltage Products Vendor— Affected SINAMICS SL150: All versions, SINAMICS SM150: All versions, SINAMICS SM150i: All versions Fixed in — No fix listed CNA
CPE configurations NVD · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:siemens:sinamics_sl150_firmware:*:*:*:*:*:*:*:* | all versions | Vulnerable | Siemens |
| cpe:2.3:h:siemens:sinamics_sl150:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
| cpe:2.3:o:siemens:sinamics_sm150_firmware:*:*:*:*:*:*:*:* | all versions | Vulnerable | Siemens |
| cpe:2.3:h:siemens:sinamics_sm150:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
| cpe:2.3:o:siemens:sinamics_sm150i_firmware:*:*:*:*:*:*:*:* | all versions | Vulnerable | Siemens |
| cpe:2.3:h:siemens:sinamics_sm150i:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
- cpe:2.3:o:siemens:sinamics_sl150_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Siemens
- cpe:2.3:h:siemens:sinamics_sl150:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
- cpe:2.3:o:siemens:sinamics_sm150_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Siemens
- cpe:2.3:h:siemens:sinamics_sm150:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
- cpe:2.3:o:siemens:sinamics_sm150i_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Siemens
- cpe:2.3:h:siemens:sinamics_sm150i:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-31337
- 2026-10-03 Alias added: GHSA-hwxw-fmr7-f2c3
References
More Siemens Sinamics Sl150 Firmware vulnerabilities
- TI-2020-12433 Missing authentication in Siemens SIMATIC HMI Comfort Panels CVSS 3.1CRITICAL 9.8
- TI-2021-08877 A vulnerability has been identified in SIMATIC HMI Comfort Outdoor Panels V15 7\" & 15\"… CVSS 3.1CRITICAL 9.8
- TI-2021-08881 Improper input validation in SINAMICS Medium Voltage Products, Remote Access CVSS 3.1CRITICAL 9.8
- TI-2021-08878 Uncontrolled resource consumption in Siemens SIMATIC HMI Comfort Outdoor Panels V15 7\" &… CVSS 3.1HIGH 7.5
- TI-2019-08156 Uncontrolled resource consumption in Siemens Development/Evaluation Kits for PROFINET IO… CVSS 3.1HIGH 7.5
- TI-2021-08879 Memory leak in Siemens SIMATIC HMI Comfort Outdoor Panels V15 7\" & 15\" CVSS 3.1HIGH 7.5
Sources
- CVE-2021-31337 · CVE Program
- CVE-2021-31337 · NVD
- FIRST EPSS
- GHSA-hwxw-fmr7-f2c3 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences